Muffler.



` Patented MayM, |90L G. J. LOOMIS.

M U F F L E R.

(Application led Oct. 9, 1900.)

(No Model.)

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UNITED STATES PATENT OFFICE.

GILBERT J. LOOMIS, OF WEST-FIELD, MASSACHUSETTS.

- MUFFLER.

SPECIFICATION forming part of Letters Patent No. 674,210, dated May 14, 190'1.

l Application filed October 9, 1900. Serial No. 32,477. (No model.)

To a/ZZ whom, it may con/cern:

Be it known that I, GILBERT J. Looivns, a citizen of the United States, and a resident of Westfield, in the county of Hampden and State of Massachusetts, have invented a new and Improved Muftler, of which the following is a full, clear, and exact description.

My invention relates to muiiiers-that is, to devices for deadening the noise'produced by steam, vapor, or gas discharged under pressure into the atmosphere-and is particularly adapted for use in connection with the exhaust-pipe of an automobile to do away as fully as possible with the unpleasant puing noise observable in many automobiles and to cause the exhaust' to pass into theatmosphere in the nature of a steady stream. The construction by which rvI secure this result will be fully describedhereinafter andthe features of novelty pointed out in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a longitudinal section of my improved muiiier on line1'1 of Fig. 2. Fig. 2

is an end view thereof from the left-hand sideY of Fig. 1, and Fig. 3 is 3 3 of Fig. 1.

The improved muftler comprises a central pipe 1, adapted for connection with the` exhaust-port of the engine and having an exterior screw-thread at eachend. Upon oneend of the pipe 1 screws a cap 13,.engaging a head 14, while the other endof the pipe 1 receives a nut 2, engaging a head 3. The heads 3 and 14 are provided with two shoulders, forming seats for an inner shell 6 and an outer shell 4, made of sheet-iron or other suitablematerial. The cap 13 and nut 2 serve to clamp the heads and shells together. The space 5 between the two shells is preferably illedwith asbestos, sand, orother materialsuitable for deadening sound'. Within the 'hollow body a cross-sectionk on line formed by the shells 4' 6 andthe heads 3 14.

Iarrange a partitionfor diaphragm 11, which is held against longitudinal movement by means of sleeves 7 12,`engaging the heads and the diaphragm andy slipped over the central tube 1. Thediaphragm divides ther hollow body into two compartments 16 and 17, re-

spectively, and the sleeve 7 in the compartment 16 is provided with apertures or slots 8, registering with similar apertures 9 in the pipe l. The partition 11 carries a series of tubes l0, projecting into the compartments 16 and 17 and establishing a communication between them, and similar tubes 15 project from the outlet-head 14 into the outlet-compartment 17 and into the atmosphere.

In operation the exhaust enters the pipe 1 at the inlet-head 3 and travels the entire length of the pipe until it strikes the cap 13. Then the exhaust rebounds in the pipe 1 and passes into the compartment 16 through the apertures 9 and 8. The exhaust expands in said compartment and being thus under a reduced pressure passes through the tubes 10 of the partition l1 into the other chamber or compartment 17. Here a further expansion takes place, and finally the exhaust issues into the atmosphere through the pipes 15 in a series of narrow jets under a slight pressure. The spent motive -agent passes into the atmosphere in a practically steady stream,

n this result being due to the considerable reduction of pressure in the chamber 17 and to the breaking up of the exhaust into tine jets by the tubes'll and 15.` The filling of the space 5l with asbestos or other suitable material also contributes to deaden the sound.

, I desire it to be understood thatvarious f Vmodifications may be made without departing posed horizontally, as shown, or vertically,r

with the discharge-tubes 15 at the lower end or in any other position .that may be suitable in each individual case.

Having thus described my invention,` I claim as newand desire to secure by Letters Patentl. A m under comprising a pipe closed at one end, heads fitted on said pipe, a shellr held between said heads, forming a hollowbodyvwhich surrounds the pipe, the latter being provided adjacent to the inlet-head with apertures leading into said body, discharge tubes extending into the atmosphere through between the said discharge-tubes and the said the other or outlet head and projecting from apertures in the pipe, and tubes extending l5 the latter outwardly, a partition surrounding lengthwise of the body through the said pary the pipe between the said apertures thereof tition andprojeoting both in advance and in 5 and the outlet-head, and tubes extending the rear thereof.

throughthe said partition and projeotingfro In rtestimony whereof I have signed my the same at each side thereof. name to this -specification inthe presence of 2o 2. .A inuiiiier eoinprisinga pipe closed at one two subscribing witnesses.

end, a. hollow body surrounding said pipe, the

latter being provided with apertures leading into the said body, discharge-tubes leading f from the' interior of the body into the atmosphere, a partition located Within the body GILBERT J. LOOMIS.

S. AUGUSTUS ALLEN,l FREDERIC A. BALLOU. 

